Achieving significantly enhanced dielectric performance of reduced graphene oxide/polymer composite by covalent modification of graphene oxide surface

Tong, Wangshu; Zhang, Yihe; Zhang, Qian; Luan, Xinglong; Yang, Dayong; Pan, Shaofeng; Lv, Fengzhu; An, Qi

doi:10.1016/j.carbon.2015.07.005

Cited by 113 publications

(78 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As to PASP-GO, the interaction between GO and PASP is dominated by chemical bonding. 29 Compared with PASP/GO-noncovalent, the content of N1 groups in PASP-GO-1/1 dramatically decreases from 36.3 to 5.0%, and the concentration of N3 groups increases from 6.4 to 48.4%, indicating the occurrence of the amidation reaction in PASP-GO-1/1. 29 To further study the interaction between GO and PASP of two kinds of PASP-modified GO nanocomposites, the XPS measurements were detected.…”

Section: Resultsmentioning

confidence: 91%

“…It is well known that amidation is a reversible reaction and water is one of the reaction products. 29 To further study the interaction between GO and PASP of two kinds of PASP-modified GO nanocomposites, the XPS measurements were detected. Hence, as to PASP/GO-noncovalent, the interaction between GO and PASP is dominated by hydrogen bonding, which is mainly induced by the polar functional groups of GO and PASP.…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure 2(b), the amidation can occur between PASP and GO, as well as within PASP chains itself, thus the amino groups of PASP may have three chemical states labeled N1, N2, and N3, respectively. 29 To further study the interaction between GO and PASP of two kinds of PASP-modified GO nanocomposites, the XPS measurements were detected. Figure 3(a) provides the XPS survey spectra of PASP/GO-noncovalent and PASP-GO-1/1; the nitrogen content of PASP-GO-1/1 is clearly higher than that of PASP/ GO-noncovalent, which means the chemically modified GO can graft more polymers.…”

Section: Characterization Of Pasp-functionalized Go Nanosheetsmentioning

confidence: 99%

See 2 more Smart Citations

Effect of polyaspartic acid‐functionalized graphene oxide on the mechanical performance of polyimide‐based composites

Yuan

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

Graphene oxide (GO) can improve the mechanical property of polymer matrix greatly. However, its poor dispersibility may considerably lower reinforcing efficiency. To address this problem, the environment-friendly polyaspartic acid (PASP) was adopted to modify GO through two generally modified methods: hydrogen bond adsorption and chemical graft modification. Findings indicate that the covalent bond grafted PASP-GO exhibits better dispersibility than the product by noncovalent method (PASP/GO-noncovalent). For chemically grafted PASP-GO, the nearly spherical polymer nanoparticles are formed on the GO nanosheets through self-polymerization, and its size can be well manipulated by adjusting the dosage of PASP so as to yield PASP-GO-1/4, PASP-GO-1/2, and PASP-GO-1/1 (mass ratio: m PASP /m GO = 1/4, 1/2, and 1/1); the corresponding diameters of these polymer aggregates are 56.4 AE 7.1, 90.1 AE 12.6, and 151.2 AE 16.1 nm. They are further utilized to reinforce polyimide matrix. Compared with the PASP-GO-1/2 and PASP-GO-1/1, the smaller PASP-GO-1/4 has better strengthening effect, due to its high specific surface area and dense distribution. This desirable fabrication of GO-based nanofillers provides a new avenue on the development of polymer matrix with comprehensive performances.

show abstract

Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Characterization Of Pasp-functionalized Go Nanosheetsmentioning

confidence: 99%

See 1 more Smart Citation

Effect of polyaspartic acid‐functionalized graphene oxide on the mechanical performance of polyimide‐based composites

Yuan

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Thec omposite film of PEI-rGO/ PVDF-HFP displayed au niform black color (Figure 2e), suggesting that the PEI-rGO fillers were distributed homogeneously in the films at the macroscopic level. [22] An optimized filler fraction of 10 wt %p resented advantageous dielectric and piezoelectric properties.T he dielectric constant for the composite film with 10 %filler fraction was enhanced to 121 ( Figure 2g), which was 9t imes the value of the pure PVDF-HFP film (approximately 13). The film cross-section displayed homogeneous morphologies without phase separation, strongly supporting the notion of ah igh filler-matrix compatibility.…”

mentioning

confidence: 99%

“…The film cross-section displayed homogeneous morphologies without phase separation, strongly supporting the notion of ah igh filler-matrix compatibility. [22] An optimized filler fraction of 10 wt %p resented advantageous dielectric and piezoelectric properties.T he dielectric constant for the composite film with 10 %filler fraction was enhanced to 121 ( Figure 2g), which was 9t imes the value of the pure PVDF-HFP film (approximately 13). In the meantime,the dielectric loss for the composite film at 100 Hz was only 0.17 (Figure 2g), which was only 67 %h igher than that of the pure PVDF-HFP film.…”

mentioning

confidence: 99%

Surface‐Enhanced Raman Spectra Promoted by a Finger Press in an All‐Solid‐State Flexible Energy Conversion and Storage Film

Dai

Zhang

et al. 2017

Angew Chem Int Ed

Self Cite

View full text Add to dashboard Cite

Electrochemically up-regulated surface-enhanced Raman spectroscopy (E-SERS) effectively increases Raman signal intensities. However, the instrumental requirements and the conventional measurement conditions in an electrolyte cell have hampered its application in fast and on-site detection. To circumvent the inconveniences of E-SERS, we propose a self-energizing substrate that provides electrical potential by converting film deformation from a finger press into stored electrical energy. The substrate combines an energy conversion film and a SERS-active Ag nanowire layer. A composite film prepared from a piezoelectric polymer matrix and surface-engineered rGO that simultaneously presents high permittivity and low dielectric loss is the key component herein. Using our substrate, increased E-SERS signals up to 10 times from a variety of molecules were obtained in the open air. Various tests on real-life sample surfaces demonstrated the potentials of the substrate in fast on-site detection.

show abstract

An All‐Solid‐State Flexible Piezoelectric High‐k Film Functioning as Both a Generator and In Situ Storage Unit

Tong

Zhang

et al. 2015

Adv Funct Materials

Self Cite

View full text Add to dashboard Cite

7029wileyonlinelibrary.com result, mechanical energy was converted and directly stored as electrochemical energy. [ 21,22 ] In addition, the application conditions of the motion-harvesting devices require an all-solid-state design in order to avoid leakage and guarantee safe applications. While devices that simultaneously meet these requirements are highly appealing, at the same time, an all-solid-state fl exible generator that converts ambient environmental motions into stored electric energy is very challenging to fabricate. Ramadoss et al. recently reported on such a functionally integrated device which they created by integrating the piezoelectric fi lm with an all-solid-state lithium battery. [ 23 ] In our study, we achieved a solid-state fl exible piezoelectric generatorand-capacitor fi lm by using an entirely new mechanism. This mechanism allowed us to convert low-frequency biomechanical energy into stored electricity in capacitors as shown in Figure 1 a-d. The core of our device was a highk fl exible piezoelectric composite fi lm prepared from poly(vinylidene fl uorideco -hexafl uoropropylene) (PVDF-HFP) as matrices and reduced graphene oxide (rGO) as fi llers as shown in Figure 1 e,f. PVDF-HFP served a simultaneous dual role: 1) the piezoelectric unit for the generator and 2) the polymeric matrices for the highk fi lm in the capacitor.The key issue for achieving high performance of electric storage was the chemical modifi cation of rGO fi llers with 4-azidotetrafl uorobenzoic acid (TFB) in order to enhance permittivity and keep the electric loss of the fi lm at low values. [24][25][26][27][28][29] The advantageous dielectric performance of our fi lm was achieved by enhancing the compatibility of rGO fi llers and PVDF-HFP matrices. In addition, a microcapacitor model properly explained the dielectric behavior of our composite fi lm. The in situ storage ability of our device allowed timely decoupled motion-energy harvest as well as the output of motion-generated electricity. Different from previous reports, in our study, electric energy was stored in capacitors instead of batteries. This report establishes linkage of the fi eld of PVDF-based piezoelectric generators and the discipline of fl exible highk composite fi lms. These unique features of our simply fabricated device should potentially enhance new possibilities in the fi elds of sensor applications, information storage, and fl exible highvoltage output designs.An all-solid-state fl exible generator-capacitor polymer composite fi lm converts low-frequency biomechanical energy into stored electric energy. This design, which combines the functionality of a generator with a capacitor, is realized by employing poly(vinylidene fl uoride-co -hexafl uoropropylene) (PVDF-HFP) in the simultaneous dual role of piezoelectric generator and polymer matrices of the fl exible capacitor. Proper surface modifi cation of the reduced graphene oxide (rGO) fi llers in the polymeric matrices is indispensable in achieving the superior energy storage performance of the comp...

show abstract

Achieving significantly enhanced dielectric performance of reduced graphene oxide/polymer composite by covalent modification of graphene oxide surface

Cited by 113 publications

References 52 publications

Effect of polyaspartic acid‐functionalized graphene oxide on the mechanical performance of polyimide‐based composites

Effect of polyaspartic acid‐functionalized graphene oxide on the mechanical performance of polyimide‐based composites

Surface‐Enhanced Raman Spectra Promoted by a Finger Press in an All‐Solid‐State Flexible Energy Conversion and Storage Film

An All‐Solid‐State Flexible Piezoelectric High‐k Film Functioning as Both a Generator and In Situ Storage Unit

Contact Info

Product

Resources

About